Answer:
- <em>He realized that some elements had not been discovered.</em>
Explanation:
Some scientists that tried to arrange the list of elements known before Mendeleev include Antoine Lavoisier, Johann Döbereiner, Alexandre Béguyer de Chancourtois, John Newlands, and Julius Lothar Meyer.
<em>Dimitri Mendeleev</em> was so succesful that he is recognized as the most important in such work.
Mendeleev by writing the properties of the elements on cards elaborated by him, and "playing" trying to order them, realized that, some properties regularly (periodically) repeated.
The elements were sorted in increasing atomic weight (which is not the actual order in the periodic table), but when an element did not meet the pattern discovered, he moved it to a position were its properties fitted.
The amazing creativity of Mendeleev led him to leave blanks for what he thought were places that should be occupied by elements yet undiscovered. More amazing is that he was able to predict the properties of some of those elements.
When years after some of the elements were discovered, the genius of Mendeleev was proven because the "new" elements had the properties predicted by him.
I believe the answer is option B. The bonded pair of valence electrons are shown using circles
Answer:
a fundamental universal constant, the speed at which light and all forms of electromagnetic radiation travel in a vacuum, standardized ...
Explanation:
299 792 458 m / s
Answer:
P₂ = 1.12 atm
Explanation:
To find the new pressure, you need to use the Combined Gas Law:
In this equation, "P₁", "V₁", and "T₁" represent the initial pressure, volume, and temperature. "P₂", "V₂", and "T₂" represent the new pressure, volume, and temperature. Before plugging the values into the equation, you need to
(1) convert the pressure from mmHg to atm (760 mmHg = 1 atm)
(2) convert the temperatures from Celsius to Kelvin (°C + 273)
The final answer should have 3 sig figs like the given values.
P₁ = 365 mmHg / 760 = 0.480 atm P₂ = ? atm
V₁ = 5.00 L V₂ = 2.30 L
T₁ = 20°C + 273 = 293 K T₂ = 40°C + 273 = 313 K
<----- Combined Gas Law
<----- Insert values
<----- Simplify left side
<----- Multiply both sides by 313
<----- Divide both sides by 2.30
